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jedisct1's profile
Frank
Frank
Frank
@jedisct1

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Frank

@jedisct1

France
Joined November 2008

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    Frank‏ @jedisct1 3 Nov 2019
    • Report Tweet
    • Report NetzDG Violation

    New blog post: Stop using ridiculously low DNS TTLs, now https://00f.net/2019/11/03/stop-using-low-dns-ttls/ …

    8:20 AM - 3 Nov 2019
    • 157 Retweets
    • 276 Likes
    • Till Chloride Cull 🏳️‍🌈 barranco Brady Donovan Zhao Xiaohong Adam Nelson ⨈Һ𝘢ʈ ╤ћᘓ 𝔽ᵁʗꗪ❓ Daniel Struck Patrick Bisenius
    12 replies 157 retweets 276 likes
      1. New conversation
      2. rich lafferty, contributing factor‏ @mendel 3 Nov 2019
        • Report Tweet
        • Report NetzDG Violation
        Replying to @jedisct1

        You can’t just lob “The urban legend that DNS-based load balancing depends on TTLs (it doesn’t)“ without an explanation! If I have an endpoint go away I want people to stop using it quickly. (Or are you referring to the case where all the endpoints are up?)

        1 reply 0 retweets 1 like
      3. Dennis Clark‏ @boomerangfish 3 Nov 2019
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        Replying to @mendel @jedisct1

        DNS-based load balancing relies on multi-value DNS records. If an endpoint fails the client can try the next value in the record without having to do another query. As long as the clients are quick at doing this, having dead endpoints in the record is not much of a problem.

        1 reply 0 retweets 7 likes
      4. 4 more replies
      1. New conversation
      2. Pascal Ernster  🏳️‍🌈 🇪🇺 🇱🇺‏ @srslypascal 3 Nov 2019
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        Replying to @jedisct1

        DynDNS might be another use case for short TTLs (and one which I'd consider "legitimate"). Also, some zones are 100% irrelevant to human users and are only used for automation purposes ("_acme-challenge" records/zones come to mind).

        1 reply 0 retweets 10 likes
      3. PulkoMandy‏ @pulkomandy 3 Nov 2019
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        Replying to @srslypascal @jedisct1

        If you can't afford a static IP, surely your service isn't so critical that 30 minutes of downtime would be a huge problem?

        3 replies 0 retweets 14 likes
      4. 1 more reply
      1. New conversation
      2. David Jones‏ @BladeFireLight 3 Nov 2019
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        Replying to @jedisct1

        having been in IT back when the TTL standard was 3days. I would rather have high DNS trafic then have to explain a multi day outage due to DNS.

        2 replies 0 retweets 16 likes
      3. Wouter Verhelst‏ @wouter_verhelst 3 Nov 2019
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        Replying to @BladeFireLight @jedisct1

        There's a world of difference between 'not wanting 3 days' and 'going down to less than a minute'. One is reasonable; the other is not.

        0 replies 0 retweets 7 likes
      4. End of conversation
      1. DrewDad‏ @tx_drewdad 3 Nov 2019
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        Replying to @jedisct1

        Alternate take: Bandwidth increases/latency reduction has made it so that DNS traffic efficiency is less important than developer angst. How long is the DNS lookup compared to the page load time? Can't see that this is affecting the end user experience much.

        0 replies 0 retweets 7 likes
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      1. Tim Chase‏ @gumnos 3 Nov 2019
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        Replying to @jedisct1 @romanzolotarev

        This blows my mind that anybody would do such short times in production. It's one thing to have a low (<15min) TTL for testing DNS changes. But once they're shown to be working, anything less than an hour is pretty crazy (I'd posit that even <6hr is still pretty questionable).

        0 replies 0 retweets 5 likes
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      1. New conversation
      2. Rubix1138‏ @XavierAshe 3 Nov 2019
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        Replying to @jedisct1

        Isn't this a technique for an attack? The name escapes me, but it's a way for an attacker to run exploits on internal assets like home routers.

        1 reply 0 retweets 0 likes
      3. Rubix1138‏ @XavierAshe 3 Nov 2019
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        Replying to @XavierAshe @jedisct1

        I found it... DNS rebinding attack.https://danielmiessler.com/blog/dns-rebinding-explained/ …

        0 replies 0 retweets 7 likes
      4. End of conversation

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